MC74VHCT240ADT

Overview

The MC74VHCT240ADT is an octal buffer and line driver manufactured by onsemi, belonging to the 74VHCT logic series. It features eight independent channels with inverting functionality and three-state outputs. The device operates within a supply voltage range of 4.5V to 5.5V. It utilizes a 20-pin TSSOP surface-mount package. Key electrical characteristics include output drive currents of 8mA for both high and low states. The component supports operation across a temperature range of -40°C to +85°C.

Feature Summary

• Provides octal buffering with inverting signal path
• Features three-state outputs for bus driving applications
• Compatible with standard CMOS logic levels via VHCT input structure

Applications

• Bus-oriented memory and address drivers
• Clock drivers and buffering
• High noise immunity receiving and buffering

Procurement Notes

Verify the specific suffix 'ADT' against official onsemi documentation to confirm pinout and package dimensions. Confirm RoHS compliance status as older batches may differ. Check for obsolescence notices or PCN documents prior to final design approval. Ensure the supplier provides valid traceability data for this discontinued or legacy part number.

Selection Notes

Select this component when an octal inverting buffer with three-state capability is required in a 20-TSSOP package. The VHCT series ensures compatibility with 5V CMOS devices while accepting TTL-compatible input levels. Verify that the 4.5V to 5.5V supply requirement aligns with the system power rails. Consider the 8mA drive strength for load requirements.

Part Context

This part belongs to the 74VHCT family of high-speed CMOS logic devices. The VHCT series is designed to interface directly with TTL inputs while offering CMOS output characteristics. The 240 variant specifically denotes an octal buffer/driver configuration. This family is commonly used in digital systems requiring signal isolation and bus management.

Replacement Considerations

Direct substitutes include MC74VHCT240ADTR2G and MM74HCT240MTCX. Verify pin compatibility and electrical specifications before substitution. Cross-reference datasheets for any differences in propagation delay or output current capabilities.